Specifying instrument response files:
The pole-zero instrument responses for a given trace is specified by the first of the following files that is found:
(1) The file specified by the "response" parameter following the data channel file URL specification "-channel.N", or
(2) The file whose name is the data channel file URL concatenated with "." and the string specified by the "channel.response.ext=" program parameter, or
(3) A file with standard rdseed naming (e.g. SAC_PZs_GE_STU_BHZ__2000.001.00.00.00.0000) that matches the net_sta_chan_loc of the trace if "channel.response.file=RDSEED_SAC_PZ" , or
(4) A file whose name is the data channel file URL concatenated with ".pz", ".zp" or ".paz" if "channel.response.file=PAZ", or
(5) A global response file specified in the "channel.response.file=" program parameter
The response files are searched for in the directory specified by "-channel.response.path="
If "-channel.response.type=POLE_ZERO" the pole-zero response file must be in "Omega" format (see e.g. http://www.iris.edu/manuals/sac/SAC_Commands/transfer) and must give the scaling to nanometers of ground displacement unless specified otherwise by the "-channel.response.units.before=" parameter.
If "-channel.response.type=GSE" the pole-zero response file must be in GSE2.0 or GSE2.1 format.
See also the paramters: "-channel.response.*"